[issue19537] Fix misalignment in fastsearch_memchr_1char

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Antoine, if sizeof(PyUnicodeObject) is 38, the start of UCS4 unicode string is not aligned. This should be fixed.

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stage: patch review -> needs patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19537>
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